<template>
  <div class="todo-header">
        <input type="text" placeholder="请输入你的任务名称，按回车键确认" @keyup.enter="addTudo"/>
      </div>
</template>

<script>
import {nanoid} from 'nanoid'
  export default {
    name:'Hearder',
    props:['addNewTodo'],
    methods:{
      addTudo(event){
        let {value} = event.target;
        // console.log(value);
        // 输入框不能为空  用字符串方法 trim()
        if(!value.trim()) return alert('输入框不能为空')
        let newObj = {id:nanoid(),title:value,done:false}
        let  result = this.addNewTodo(newObj)
        if(result)  event.target.value = "";
      }
    }
  }
</script>

<style scoped>
  /*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>